ICS85222AM datasheet(8/12 Pages) ICST

Il numero della parte	ICS85222AM

Spiegazioni elettronici	DUAL LVCMOS / LVTTL-TO DIFFERENTIAL LVHSTL TRANSLATOR

PDF	12 Pages

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Produttore elettronici	ICST [Integrated Circuit Systems]

Homepage	http://www.icst.com

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8 / 12 page

85222AM

www.icst.com/products/hiperclocks.html

REV. B MARCH 31, 2005

Integrated

Circuit

Systems, Inc.

ICS85222

DUAL LVCMOS / LVTTL-TO-

DIFFERENTIAL LVHSTL TRANSLATOR

3. Calculations and Equations.

The purpose of this section is to derive the power dissipated into the load.

LVHSTL output driver circuit and termination are shown in

Figure 2.

To calculate worst case power dissipation into the load, use the following equations which assume a 50

Ω load.

Pd_H is power dissipation when the output drives high.

Pd_L is the power dissipation when the output drives low.

Pd_H = (V

OH_MAX

) * (V

DD_MAX

- V

OH_MAX

)

Pd_L = (V

OL_MAX

) * (V

DD_MAX

- V

OL_MAX

)

Pd_H = (1.2V/50

Ω) * (3.465V - 1.2V) = 54.4mW

Pd_L = (0.4V/50

Ω) * (3.465V - 0.4V) = 24.52mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 78.9mW

FIGURE 2. LVHSTL DRIVER CIRCUIT AND TERMINATION

OUT

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